Assuming you are in the same account as last year, please see my detailed answer in this other thread:
https://ttlc.intuit.com/community/after-you-file/discussion/re-i-d-like-to-access-my-last-year-s-tax-return-there-s-no-document-on-the-left-menu-to-select/01/1792751#M466687
After you follow the info in that other thread, if you see no evidence of your prior returns in the "Your Tax Returns and Documents" section of that account, we can tell you how to look for multiple accounts.